Paul Gertler is the Li Ka Shing Professor of Economics at the University of California, Berkeley where he holds appointments in the Haas School of Business and the School of Public Health. He is also the Scientific Director of the UC Center for Effective Global Action. Dr. Gertler is an internationally recognized expert in impact evaluation. Dr. Gertler was Chief Economist of the Human Development Network of the World Bank from 2004-2007 and the Founding Chair of the Board of Directors of the International Initiative for Impact Evaluation (3ie) from 2009-2012.  At the World Bank he led an effort to institutionalize and scale up impact evaluation for learning what works in human development. He is the author of the bestselling textbook Applied Impact Evaluation published by the World Bank Press. He has been a Principal Investigator on a large number of at-scale multi-site impact evaluations including Mexico’s CCT program, PROGRESA/OPORTUNIDADES, and Rwanda’s Health Care Pay-for-Performance scheme. He holds a PhD in economics from the University of Wisconsin and prior to UC Berkeley has held academic appointments at Harvard, RAND, and SUNY Stony Brook.